Facebook Page Video Reach Dead?

I was working with Keli Network and sharing their videos. Before sharing their videos my page video reach was good i mean whenever i share some humor video i get reach between 21000-70000, Okay so i started sharing their videos and initially their videos gets good reach but then reach drop to dead almost between 400-900 or max 1200 then i shared some funny video on page and reach is similar around 500-1500. Anyone faced that issue ? I recommend to you guys not post prodcut video on your humor sort of pages otherwise you video reach gone.

Ps : (I am talking about other pages video shares on my page, If i upload video on my page it get normal reach but whenever i share video from other page its get no reach doesn’t matter how viral or engaging video is that)